Hi All,
my input voltage varies from around 12-20V, maybe dipping below 12V too sometimes.
I require 12V 50mA power supply, an efficient one, my current schematic uses a step down, which then drives a step up (as well as other circuitry)
how can i do this more efficiently?
Regards

While it is technically possible to not use a transformer it is very unsafe to do so. For this reason a transformer must be used for a project done at AAC.

Transformers generally are very efficient parts, their conversion efficiencies can exceed 95%, though it is not a given.

A switching mode power supply (SMPS) is also very efficient, or can be. They tend to be a bit more noisy than their linear counterparts. The linear versions are much quieter, but make a lot more heat. Everything is a trade off.

Hi All,
my input voltage varies from around 12-20V, maybe dipping below 12V too sometimes.
I require 12V 50mA power supply, an efficient one, my current schematic uses a step down, which then drives a step up (as well as other circuitry)
how can i do this more efficiently?
Regards

Hi All,
my input voltage varies from around 12-20V, maybe dipping below 12V too sometimes.
I require 12V 50mA power supply, an efficient one, my current schematic uses a step down, which then drives a step up (as well as other circuitry)
how can i do this more efficiently?
Regards

Click to expand...

If the input is both above and below the regulated output, I beieve you need to use a buck-boost switcher.